There is an obvious redundancy:

--with-driver=dri VS --with-state-trackers=dri
--with-driver=xlib VS --with-state-trackers=glx
--enable-openvg VS --with-state-trackers=vega
--enable-egl VS --with-state-trackers=egl

This patch adds two new options for the remaining state trackers:
--enable-xorg
--enable-d3d1x

Reviewed-by: Alex Deucher <alexdeucher@gmail.com>